DPP-Inorganic Chemistry-3 to 4-Answer

Subject : Physical/Inorg. Chemistry Date : DPP No. 3 Class : XIII Course : DPP No.1 Total Marks : 34 Max. Time : 35 min. Single choice Objective ('–1' negative marking) Q.1 to Q.10 (3 marks 3 min.) [30, 30] Subjective Questions ('–1' negative marking) Q.11 (4 marks 5 min.) [4, 5] 1. Which of the following contains the greatest number of atoms ? (1*) 1.0 g of butane (C4H10) (2) 1.0 g of nitrogen (N2) (3) 1.0 g of silver (Ag) (4) 1.0 g of water (H2O) 1 1 Sol. (1) Number of atoms = 58 1 (3) Number of atoms = 108 × 14NA = 0.24 NA. (2) Number of atoms = 28 1 × NA = 0.009NA. (4) Number of atoms = 18 × 2NA = 0.07NA. × 3NA = 0.167NA. 2. A gaseous mixture contains CO2(g) and H2(g) in a 2.2 : 1 ratio by mass. The ratio of the number of molecules of CO2(g) and H2(g) is - (1) 5 :2 (2*) 1 : 10 (3) 10 : 1 (4) 1 : 5 3. Which one of the following pairs of gases contains the same number of molecules (1*) 16g of O2 and 14g of N2 (2) 8g of O2 and 22g of CO2 (3) 28g of N2 and 22g of CO2 (4) 32g of O2 and 32g of N2 4. Number of g of oxygen in 32.2g Na2SO4.10H2O is - (1) 20.8 (2*) 22.4 (3) 2.24 (4) 2.08 5. The number of oxygen atoms in 4.4g of CO2 is approx (1*) 1.2 × 1023 (2) 6 × 1022 (3) 6 × 1023 (4) 12 × 1023 6. How many molecules are present in one gram of hydrogen (1) 6.02 × 1023 (2*) 3.01 × 1023 (3) 2.5 × 1023 (4) 1.5 × 1023 7. The total number of g-molecules of SO2Cl2 in 13.5g of sulphuryl chloride is : (1*) 0.1 (2) 0.2 (3) 0.3 (4) 0.4 8. The largest number of molecules is in (1*) 34g of water (2) 28g of CO2 (3) 46g of CH3OH (4) 54g of N2O5 9. The number of moles of sodium oxide in 620g of it is - (1) 1 mol (2*) 10 moles (3) 18 moles (4) 100 moles 10. 2g of oxygen contains number of atoms equal to that in (1) 0.5g of hydrogen (2*) 4g of sulphur (3) 7g of nitrogen (4) 2.3g of sodium 11. The number of molecules in 16 g of methane is : (1) 3  1023 (2*) 6.02  1023 (3) 16/6.02  1023 (4) 16/3.0  1023 12. 11.2 L of a gas at STP weights 14.0 g. The gas could be - (1) N2O (2) NO2 (3*) N2 (4*) CO 13. The weight of 1 mole of a gas of density 0.1784 g/Lt. at NTP is : (1) 0.1784 g (2) 1 g (3*) 4 g (4) Cannot be Calculate Subject : Physical/Inorg. Chemistry Date : DPP No. 4 Class : XIII Course : DPP No.2 Total Marks : 32 Max. Time : 33 min. Single choice Objective ('–1' negative marking) Q.1 to Q.8 (3 marks 3 min.) [24, 24] Match the Following (no negative marking) Q.9 (4 marks 4 min.) [4, 4] Subjective Questions ('–1' negative marking) Q.10 (4 marks 5 min.) [4, 5] 1. If 224 ml of a triatomic gas has a mass of 1 g at 273 K and 1 atm pressure, then the mass of one atom is. (1) 55.3  10–22 g (2) 0.553  10–23 g (3*) 5.53  10–23 (4) 553  10–23 g 2. The weight of iron which will be converted into its oxide (Fe3O4) by the action of 18 g of steam on it will be (at wt. of Fe = 56) (1) 168 (2) 84 g (3*) 42 g (4) 21 g 3. The weight of 1 mole of a gas of density 0.1784 g/Lt. at NTP is : (1) 0.1784 g (2) 1 g (3*) 4 g (4) Cannot be Calculate 4. Which of the following contains greatest number of oxygen atoms ? (1) 1 g of O (2) 1 g of O2 (3) 1 g of O3 (4*) All have the same number of atoms 5. The total number of ions present in 1 ml of 0.1M barium nitrate solution is : (1) 6.02 × 1018 (2) 6.02 × 1019 (3*) 3.0 × 6.02 × 1019 (4) 3.0 × 6.02 × 1018 6. If LPG cylinder contains mixture of butane and isobutane, then the amount of oxygen that would be required for combustion of 1 kg of it will be : (1) 1.8 kg (2) 2.7 kg (3) 4.5 kg (4*) 3.58 kg 7. Air contains nearly 20% oxygen by volume. The volume of air needed for completely combustion of 100 cc of acetylene will be. (1) 500 cc (2) 100 cc (3) 250 cc (4*) 1250 cc 8. Which pair of species have same percentage of carbon ? (1*) CH3COOH and C6H12O6 (2) CH3COOH and C2H5OH (3) HCOOCH3 and C12H22O11 (4) C6H12O6 and C12H22O11 9. Match the following : Column-I Column - II For 1 mole of reactant placed in Product open container in each reaction (A) PCl (g)   PCl (g) + Cl (g) (p) 2N molecules (B) CaCO (s)   CaO(s) + CO (g) (q) 67.2 litre gaseous product at STP (C) 2HCl (g)   H (g) + Cl (g) (r) 22.4 litre gaseous product at STP (D) NH COONH (s)   2NH (g) + CO (g) (s) 44.8 litre gaseous product at STP 4 2 3 2 Ans. (1) - p,s ; (2) - p,r ; (3) - r ; (4) - q. 10. Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure limestone (CaCO3). Ans. 106.4 kg

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